The Passkey & WebAuthn Engineering Hub
Production-grade guides, cryptographic deep-dives, and battle-tested patterns for building phishing-resistant, passwordless authentication with WebAuthn and FIDO2.
What is this resource?
The Passkey & WebAuthn Engineering Hub is a focused technical library for teams integrating modern, passwordless authentication into web applications. Every guide targets the real engineering decisions — from selecting COSE cryptographic algorithms and validating attestation certificates on the server, to designing a credential database schema that scales to millions of users.
WebAuthn eliminates shared secrets by replacing passwords with hardware-backed public key pairs. A private key is generated inside a Secure Enclave, TPM, or hardware security key and never leaves the device. Only a cryptographic proof (a signed challenge) travels over the wire — making phishing, credential stuffing, and replay attacks structurally impossible.
Whether you're building a greenfield passkey-first app, migrating legacy password flows, or hardening an enterprise identity platform to meet NIST SP 800-63B AAL2/AAL3 requirements, you'll find authoritative patterns and TypeScript/JavaScript code examples throughout.
Browse by section
Two deep-dive pillars, each with sub-topics and leaf articles.
WebAuthn & FIDO2 Protocol Fundamentals
Protocol specs, cryptographic foundations, challenge-response flows, attestation, and the trust model explained.
Backend Verification & Secure Credential Storage
Server-side verification logic, database schema design, public key storage, session management, and revocation.
Featured articles
Understanding WebAuthn vs FIDO2 Architecture
Demystify the protocol stack: how WebAuthn, CTAP2, and FIDO2 relate and where your code fits.
The Challenge-Response Authentication Flow
Step-by-step flow diagrams and TypeScript for registration and authentication sequences.
Implementing Authentication Verification Logic
Server-side signature verification, replay attack prevention, and sign-count anomaly detection.
Attestation vs Assertion Explained
When and why to verify authenticator provenance — and when attestation is overkill.
Credential Indexing & Database Schema Design
PostgreSQL schemas, composite indexes, and row-level security for high-throughput passkey lookups.
How WebAuthn Prevents Phishing Attacks
The origin-binding guarantee that makes passkeys structurally immune to phishing and MitM.